http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4129015-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0790bf6c98c09e899ca10ba31622749e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-15 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-15 |
| filingDate | 1991-08-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e5c1fd0e5f7d43ffecd25f39d7192a7f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_82b2e39ae2cd0250db9d673ae51c5d59 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7e957dadafda252028f5029bdc7d6eec http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66b00a16f6cd6ae57726da68e85d2797 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1123cca9e8e5cd60a6a0c61ab0e3ecd0 |
| publicationDate | 1993-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-4129015-A1 |
| titleOfInvention | METHOD FOR PRODUCING ACETONE DICARBONIC ACID ESTERS BY CARBOXYLATING ACETONE |
| abstract | The prepn. of acetone dicarboxylic acid esters (I) comprises carboxylation of acetone with CO2 at 10-30 deg.C and normal pressure in the presence of excess sodium phenolate and in a solvent which is N-methyl-epsilon caprolactam (NMC) or sulpholan. Towards the end of the reaction, water is added at -10 to +20 deg.C and the pptd. crystalline disodium salt of acetone dicarboxylic acid is sepd. together with NaHCO3 and the reaction prod. esterified with MeOH or EtOH without further sepn. of NaHCO3. USE/ADVANTAGE - (II) are intermediates in the organic synthesis of heterocycles and in the pharmaceutical industry. The use of NMC or sulpholan as the solvent, compared to the previously used DMF enables prod. to be pptd. after the addn. of water and filtered off for further reaction. The problems associated with work up of the DMF reaction solns. are thus avoid |
| priorityDate | 1991-08-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 46.